fusion

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gsxdsm 711bf3e1b8 FN-6746: attribute token analytics per runtime model

Persist and expand per-model token usage so Command Center reports every model used by a task.

- Add a nullable per-model token usage column and task model bucket types.
- Merge session token deltas into provider/model buckets while retaining task-level totals.
- Expand model/provider analytics from per-model buckets with legacy fallbacks for older rows.
- Cover persistence, migration, aggregation, and session accumulation behavior with tests.
- Document the per-model storage contract alongside existing token analytics tables.

Files changed:
 docs/storage.md                                    |   2 +
 packages/core/src/__tests__/db-migrate.test.ts     |  62 ++++++++++
 .../core/src/__tests__/store-persistence.test.ts   |  49 ++++++++
 .../core/src/__tests__/token-analytics.test.ts     | 127 ++++++++++++++++++++-
 packages/core/src/db.ts                            |  13 ++-
 packages/core/src/index.ts                         |   2 +-
 packages/core/src/store.ts                         |   7 +-
 packages/core/src/token-analytics.ts               |  58 ++++++++--
 packages/core/src/types.ts                         |  32 ++++++
 .../src/__tests__/session-token-usage.test.ts      |  23 ++++
 packages/engine/src/executor.ts                    |  20 +++-
 packages/engine/src/session-token-usage.ts         |  50 +++++++-
 packages/engine/src/step-session-executor.ts       |   7 ++
 13 files changed, 429 insertions(+), 23 deletions(-)

Fusion-Task-Id: FN-6746

Fusion-Task-Lineage: 1b1a3b31-b669-4e89-ac38-a871f3349015

2026-06-19 16:47:34 -07:00